1386748786 has 16 divisors (see below), whose sum is σ = 2224295640. Its totient is φ = 646124800.

The previous prime is 1386748777. The next prime is 1386748787. The reversal of 1386748786 is 6878476831.

It can be written as a sum of positive squares in 4 ways, for example, as 1374110761 + 12638025 = 37069^2 + 3555^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1386748786.

It is not an unprimeable number, because it can be changed into a prime (1386748787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 198481 + ... + 205348.

Almost surely, 2^1386748786 is an apocalyptic number.

1386748786 is a deficient number, since it is larger than the sum of its proper divisors (837546854).

1386748786 is a wasteful number, since it uses less digits than its factorization.

1386748786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403949.

The product of its digits is 10838016, while the sum is 58.

The square root of 1386748786 is about 37239.0760626523. The cubic root of 1386748786 is about 1115.1482267230.

The spelling of 1386748786 in words is "one billion, three hundred eighty-six million, seven hundred forty-eight thousand, seven hundred eighty-six".